1. Correct Answer: a: Two hours
 2. Explanation:
     Let's break down the problem step by step:
         ○ Let \( d \) be the distance between the two points.
         ○ Let \( w \) be the walking speed (in distance per hour).
         ○ Let \( v \) be the driving speed (in distance per hour).
     Given Statements:
     1. A person can walk a certain distance and drive back in six hours.
     2. He can also walk both ways in 10 hours.
     From Statement 2:
         ○ Walking both ways takes 10 hours.
         ○ Therefore, the time to walk one way is \( \frac{10}{2} = 5 \) hours.
         ○ Thus, the walking speed \( w \) is \( \frac{d}{5} \).
     From Statement 1:
         ○ Walking one way and driving back takes 6 hours.
         ○ Time to walk one way is 5 hours (as calculated above).
         ○ Therefore, the time to drive back is \( 6 - 5 = 1 \) hour.
         ○ Thus, the driving speed \( v \) is \( d \).
     To Find:
         ○ The time to drive both ways.
     Calculation:
         ○ Driving one way takes 1 hour (as calculated above).
         ○ Therefore, driving both ways takes \( 1 + 1 = 2 \) hours.
     Hence, the time taken to drive both ways is two hours.